my check light engine came on graind prix 3.8 v6 the dignostic stated a problem with my air intake manafold. with something to do with airflow, i think it may have something to do with my shutter valve cuz my car stalls on the `1st start, then on the 2nd start stays running. is their a censor that controlls it and were it would be,if not what could be the problem be thank you